What is used to avoid power drops and running power to access points?

A.
PoE-enabled switches

B.
Cisco Aironet 1140 series

C.
Midspan PSE

D.
End-point PSE

Explanation:
content\166040\plo_content\ORG1114\COURSE166040\enus_011425\lsn_08\tpc_e\enus_011425_08e.xml:
With the proliferation of wireless devices in the enterprise environment, many more access points are required to provide adequate coverage and bandwidth. Getting power to all these access points becomes a major issue. Power drops can be expensive, so getting power to access points using standard means may become prohibitively expensive very quickly. By using PoE-enabled switches and midspan devices in wiring closets, it is not necessary to run power to access points. The cost savings alone make large deployments not only possible, but also affordable.